Lifting jack



Patented July 24, 1928.

,narran srA'rss r 1,678,469 ATLENT orrics.

` ARTHUR C.` HOPKINS, OF NILES, MICHIGAN, ASSIGNOR TO .NATIONAL-STANDARD COM- PANY, 0F NILE, MICHIGAN.

LIFTIN G JACK.

" Application led May 18, 1927. Serial No. 192,266.

The main object of this invention is to provide an improved'lifting jack for motor vehicles and the like which'is very powerful and at the same time light in weight and compact when collapsed. Y bjects pertaining to details and economies of my invention will appear from the description to follow. The invention is deined in the claims.

A structure embodying the features ot my invention is illustrated in the accompanying drawing, in which:v

Fig. 1 is av side view of my improved lifting jack the actuating screw being partially broken away.

Fig. 2 is avdetail View mainly in central longitudinal section. F ig.` 3 is a. perspective View of a modified form of one of the elements of the lifting member of my improved jack. p

Fig. 4 is a detail section of kanother modification of the lifting member element.

Referring' to the drawing, my'i'mproved jacl-z comprises a tubular elbow standard l comprising an uprightporti'on 2, a horizontal `portion 3- and a connecting curved elbow 'portion 4.-. These parts are formed integrally and` preferably with `an integral base 5st the elbow portion, the upright portion `of the standard being disposed centrally this. base for stability.

l The lifting member in the embodiment shown in F ig. 2 comprises a coiled spring elemento', the coils vbeing of concavo-convex cross section, and in nesting engage` 'ment at thevouter end otv this element Gis a hcad having inwardly projecting shank portion '8 vdisposed'within the end ofk the element G. At its other end 'the element'G yis provided withfa thrust member k9, the

head and thrustmember being connected by the flexible tension member 10 which is f in the forni. of a chain in the embodiment illustrated. 1 f

This tension member terminates in a threaded rod v11 disposed through the thrust member 9 and provided with a nut l2 so that suitable tension` may be applied i to clamp the coilsA together. Thus arranged the projecting' portion of the standard is substantiallyl rigid, effectively supporting a load,v and at the same time it may be collapsed into thek standard, sliding around the bend or elbow as shown in Fig. 2.

The tension member should, of course, be

under suiicient tension to engage' the coils at the elbow so that there is no substantial variation inthe tension on the tension member as the standard is projected or retracted.

Y The actuating screw 13 has threaded engagement with thenut la :secured on the standard, ar bearing block 15 being interposed between the inner end of the screw and the thrust member 9. This block is recessed at 16 to receivethe nut 12.` n n In the'modication shown in Fig. 8' the' standard element ycorresponding to the ele` ment 6 is made up of two coils 17 and 18 threaded together, the coil 17 being formed of cylindrical cross section while the'coil 18 has seats 19 therein -to receive the coacting coil. y r

In the embodiment shown in Fig. 4 a plurality of annular members 2O are provided having recesses 21 in one side thvereoi1 to receive the adjacent/coil. kThe tension members hold these parts in the same relation as the coils in4 the lembodiment shown in Fig. 2. o

My improved jack is compact in struc` ture, especially adapting it for use in motor vehicles.y At the same time it is easy to operate;A '1

I have no'tfattempted to illustrate or describev various modifications or adaptations which I contemplate as I believe this disclosure will enable those skilled in this art to adapty my'improvementsas maybe desired. f

Having thus described my invention what Iclaimas new and desire to secure by'Le'ttersPatent is:

1; In aV lifting jack,the combination of a tubular elbowed standard or" uni'lfornr lbore fromend 'to end, the' elbow beinguniformly curved,A said standard having an integral base below its elbow, a lifting member com` prising a coiled spring slidably fitting with` in said standard and having` coils of 4a con* cavo-convex cross section in vnest-ing en gagement, a head Jfor said lifting member mounted on theouter end of said spring, a thrust member engaging the inner end of said spring, a flexible tension member secured to said head and adjustably secured to said thrust member, and an actuating screwk having threaded engagement with said standard and coacting with ksaid thrust member.

lio

2. In a lifting jack, the combination of a tubular elbowed standard, said standard having an integral base below its elbow, a lifting member comprising a coiled spring slidably fitting within said standard, a head for said lifting member mounted on the outer end of said spring, a thrust member engaging the inner end of said spring, a flexible tension member secured to said head and adjustably secured to said thrust member, and an actuating screw having threaded engagement with said standard and coacting with said thrust member.

3. In a. lifting jack, the combination of a tubular elbowed standard having a bore of uniform diameter from end to end, the elbow being of regular curvature, said standard having a base at its elbow, a lifting member comprising a coil slidable in said standard, a tension member disposed within and connected to the ends of said coil, said lifting` member being provided with a head at its outer end, and an actuating means coacting with the inner end of said coil.

4. In a lifting jack, the combination of a tubular elbowed standard, a lifting member comprising a plurality of annular parts disposed in contacting relation and provided with a head at one end and with a thrust member at the other, a tension member connecting said head and thrust member, and an actuatingv means coacting with the inner end of said lifting member.

5. In a lifting jack, the combination of a tubular elbowed standard, said standard having a base below its elbow, a lifting member comprising a coil element slidable within said standard and having coils conformed for nesting engagement, a flexible tension member disposed within and secured to the ends of said coiled element, a head for said lifting member mounted on the outer end of said coiled element, and an actuating screw having threaded engagement with said standard and coacting with the inner end of said coiled element.

6. In a lifting` jack, the combination of a tubular standard, a lifting member comprising a coil slidable in said standard, a tension member disposed within and connected to the ends of said coil, said lifting member being provided with a head at itsouter end, and an actuating means coacting with the inner end of said coil.

7. In a lifting jack, the combination of a tubular elbowed standard, a lifting member comprising a plurality of annular parts disposed in contacting relation, a tension member connected to the end parts of the'said lifting member, and an actuating means coacting with the inner end of said lifting member.

8. In a lifting jack, the combination of a tubular elbowed standard, a lifting member comprising a plurality of annular parts disposed in contacting relation, a tension member lying within said annular parts and connected to the end parts of the said lifting member, and an actuating means coacting with the inner end of said lifting member.

9. In a lifting jack, the combination of a tubular elbowed standard, a lifting member comprising a plurality of annular `parts lying in contacting relation and having coactmg concave and convex aligning surfaces, a tension member connected to the end parts of the said lifting member, and an actuating means coacting with the inner end of said lifting member.

10. In a lifting jack, the combination of a tubular elbowed standard, a lifting member comprising a plurality of annular parts disposed in contacting relation and having coacting parts to hold them in realignment, a tension member connected tothe end parts of the said lifting member, and an actuating means coacting with the inner4 end of said lifting member. c

1l. A liftingmember comprising a plurality of parts disposed in alignment in contacting relation and having a line element that elongates when the memberis exed, and a tension member` having its ends connected to tlie'end parts of the lifting member and lying in said line element, whereby the elongation ofsuch line element is limited and the flexing of said member correspondingly limited.

l2. A flexible lifting member having a line element` that elongates when flexing, and a tension member lying in said line element and having-its ends connected to the ends of sald flexible lifting member, whereby the elongation of such line elementis limited and the flexing' of` said member correspondingly limited. Y

In witness whereof I have hereunto set my hand. ARTHUR C. HOPKINS. 

